device-pixel-ratio how to handle it in css code example

Example: @media (min-resolution:1.25dppx),(-webkit-min-device-pixel-ratio:1.25),(min-device-pixel-ratio:1.25){

@media (min-resolution:1.25dppx),(-webkit-min-device-pixel-ratio:1.25),(min-device-pixel-ratio:1.25){